-66.21% is the change from 509 to 172
Calculation steps:
[( 172 - 509 ) ÷ 509] x 100 = -66.21%
Formula
Percentage change = [(172 - 509) / 509] x 100
Subtract the new number by the original number
172 - 509 = -337
-337 ÷ 509 = -0.6620825147347741
-0.6620825147347741 x 100 = -66.21%